Add database setting to configure HikariCP 'maxLifetime' #1279

src/main/java/fr/xephi/authme/settings/properties/DatabaseSettings.java

@@ -10,7 +10,7 @@ import static ch.jalu.configme.properties.PropertyInitializer.newProperty;
 public final class DatabaseSettings implements SettingsHolder {
 
     @Comment({"What type of database do you want to use?",
-            "Valid values: SQLITE, MYSQL"})
+        "Valid values: SQLITE, MYSQL"})
     public static final Property<DataSourceType> BACKEND =
         newProperty(DataSourceType.class, "DataSource.backend", DataSourceType.SQLITE);
 
@@ -114,6 +114,11 @@ public final class DatabaseSettings implements SettingsHolder {
     public static final Property<Integer> MYSQL_POOL_SIZE =
         newProperty("DataSource.poolSize", -1);
 
+    @Comment({"The maximum lifetime of a connection in the pool, default = 1800 seconds",
+        "You should set this at least 30 seconds less than mysql server wait_timeout"})
+    public static final Property<Integer> MYSQL_CONNECTION_MAX_LIFETIME =
+        newProperty("DataSource.maxLifetime", 1800);
+
     private DatabaseSettings() {
     }